<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="12.js"></script>
</head>
<body>
    <form name="" action="" method="get">
        <input id="user" type="text" name="user" value="12345" placeholder="请输入用户名" />
        <input type="password" name="password"/>
        <input id="man" type="checkbox" />男
        <input id="woman" type="checkbox" />女

        <select id="city">
            <option value="001">上海</option>
            <option value="002">舟山</option>
            <option value="003">东北</option>
        </select><br/>
        <button type="submit">提交</button>
    </form>
</body>
</html>